Blow torch gas refills

There is no shortage of videos of people refilling various cylinders on YouTube. The problem is usually finding a suitable adaptor. If it has the common threaded lindel fitting, about 8 mm in diameter as found on some those used on some camping stoves, adaptors are available. Then you need a gas source.

A lot of people seem to use the cheap 220g disposable cylinders for picnic stoves available for as little as £1 each if that if you shop around. You can get a fitting which converts them to the above style and the adaptors used to transfer the gas fit between the two.

Needless to say, not the safest thing to do.

I have the same primus blow lamp but it is blue. I remember melting copper pennies with it in the mid sixties and I used it to cast a replacement aluminium roller bracket for my dad's suffolk punch mower after I ran it into a wall and broke the cast iron original. I very much doubt it was refilled after that and I retrieved it when we emptied his house in 2004. Lord knows why I kept it.

Anyway it has a collar with the tare weight stamps on it so I suppose it was refilled by weight of propane.

It is possible to move propane from one container to another, in this case the adapter would have to depress the release button at the bottom of the screw thread.

The problem with diy refills by up ending a big bottle above the empty is that of over filling. There is no way of controlling such that there is a gas space above the liquid to allow for thermal expansion and with these little containers there doesn't appear to be an over pressure relief like there is on propane bottle but there is a brass 3/8ths plug with a soft core which may serve this purpose.